Expanding



G. LENHART.

EXPANDING REAMEH.

APPLICATION FILED sEPT.20. 1'919.

ATTORNEY PATENT OFFICE.

GEORGE LENHART, 0F EUFAULA., OKLAHOMA.

PAN DING BEAMER.

Specication of Letters Patent.

Patented Aug. 30, 1921.

Application led September 20, 1919. Serial No. 325,122.

To all lwhom it may concern Be it known that I, GEORGE LENHART, a citizen of the United States, residing at Eufaula, in the county of McIntosh and `State of Oklahoma, have invented a new and useful Expanding Reamer, of which the following is a specification.

This invention relates to reamers of the ex ending type.

t is the special object of the invention to ish a reamer wh1ch may be adjusted to ream out various sized holes, both straight and tapered.

Another object s to provide a reamer which can be used on various types of drills or lathes.

The invention is particularly designed for automobile and other fine machinery work but is a useful tool for reaming all kinds o bushings, bearings, and holes of whatever nature.

For a complete comprehension of the construction and operation of the reamer, reference should be made to the drawing ac companying and forming a part of this Specification, with the understanding, however, that the illustrated construction may be modified and departed from, provided such modifications lie within the scope ofthe appended claims.

In the drawing- Figure 1 is an elevation of the reamer complete;

F 1g. 2 is a longitudlnal sectional view on an enlarged scale, most of the ishank belng omitted;

Fig. 3 is an elevation of the interior parts of the reamer which are operated to expand and lock the blades;

4 iS a perspective View of a b lade;

Fig. 5 is a cross section on the line 5-5 of Fig. 2 i

Fig. v6` is ,a cross section on the line 6 6 of F1g.2; and

Fig. 7 is a cross section on the line 7-7 of Fig.2. 4

Fig. 8 is a detail view of the conical follower plug.

The numeral 10 designates a shank or Stock of any conventional form which may be adaptable to a drill press, handdrill or a lathe." This shank fits into a hollow shell or stem 11 formin the body of the reamer proper. Preferab y, the shank has a reduced exteriorl screw threaded portion over which aninteriorly threaded portion of the .blocks hollow stem 11 may be passed. Locking means for the stem and shank consisting of allned 'threaded bores 14 and 15 in the two respectlve parts, and a screw 16 entering both bores removably secures the stem to the shank.

The hollow stem is provided with a series of slots 17 extending from the free or front end of the stem about two-thirds the length thereof. The slots run longitudinally, are cut radially and are of a length and width somewhat greater than that of blades 18 which they are designed to receive. The blades have sharply tapering ends 19 as Shown, with square recesses 2() in the middle extending from their inner edges.

The blade-adjusting mechanism is shown particularly in Figs. 2 and 3. It consists of a long adjusting bolt 21 having right and left hand screw threaded portions 22, 23, lying near either end and separated by a plain or unthreaded section. The inner end of the adjusting bolt has a head 24 provided with an annular groove 25. A collar 26 having a central bore fits over the head 24 and within the stem 11. A locking screw 27 is seated in the stem and extends through the collar 26 into the groove 25 as Figs. 2 and 5 disclose. The arrangement is such that the collar holds the inner end of the adjusting bolt in the center of the stem and free to rotate, and the screw 27 holds the collar from movement in any direction and locks the adjusting bolt at will.

Two conical blocks 28 are mounted on the adjusting bolt and have central threaded bores so that both will engage with the threaded portions 22, 23 of the bolt. Each conical block has a tapered end 29 and also wings 30 adajted to extend into the slots 17 of the stem. he blocks normally have their smaller ends facing each other and engage the tapered ends 19 of the blades, said tapered ends bearing upon the wings. With the wings 30 lying within the slots and the eld from rotary movement, it is clear that rotation of the adjusting bolt will cause the blocks to move longitudinally toward or from each other, because the threaded parts with which they engage are ri ht and left handed.

he outer end of the bolt turns in a bearing formed by a collar 31 fitting loosely and flush within the stem. A series of threaded holes 32, one for each section of the stem between the slots, runs around the stem near the extreme outer end. 'Matching threaded holes 33 are provided in the collar 31, and screws 34C are run into these holes. IVhen the screws 34 are tightened, the collarl is held securely in place, thus providinga second and outer bearingV for the rotatable bolt, besides acting as a stop for the outermost conical block. A collar 85 fits loosely over theV Vsquared so as to be turned bya wrench.

The manner in' which the invention is used and some of its advantages will nowbe explained.

Supposing the reamer to be adjusted and locked in the position of Fig." 2, and itis desired to adjust for a smaller bore: the

.Y 'lock' screw 27 is first loosened, then the clamping screws 37. The adjusting bolt Vcan now be turned freely in the proper direction to cause the conical blocks to spread apart. The blades-may now be pushedinwardly until they bear once more against the screws will be tightened.

blocks. Finally, the lockinof V,and clamping Izf a larger hole is toi-be reamed, the adjusting bolt will be turned to'bring the blocks closer to each other, which will force the blades outwardly through the slots. v

If a tapering hole is to be reamed, the adjusting bolt will be turned until the two blocks run ofi' their threads. Now, either the lower or the upper block will be made to engage with the rotated bolt beforethe other one does. This may be done by removing one llines in Fig. 2. If the lower block is closerblade andusing any instrument to push the blockintoY engagementl with its threads;

With the two blocks on the bolt an'unequal distance from the middle thereof, it is lclear that the blades will assume positionsfin .which ytheir ends will project unequal dis,- tances out of the slots, as shown in dotted Y to the middle of the bolt than the upper the positions of the two blocks. The closer. Y l-to the-center, orthe farther removed one block, thetaper 'will be upwardly with respect to the tool asa cutting instrumentality;

while if v4the upper block is closer, the taper` Y Y will run downwardly. The degree of taper will depend onl the relative relation between block is fromthe end, as compared with the other, the v.greater the taper.

In all positions of the blades, the blocks Vwill support them at each end, withV the if l wings 30 acting asa continuation ofthe taperedends 29 for'blade-supporting. purposes.

The clamping screws 37 will clamp VVthe blades as long as they lie in the slots. Y

The principal advantages of the reamer are that it may not only be used in various types of machines to ream many sizes of straight holes, but it may also reaIn various sizes of tapered holes without elaborate adjustment. VThe taper may run either way and may be changed without removing more than one blade. Various widths of blades may Vbe used with the same tool and thus render it still more adaptablev an instrument. straight blades, spiral blades may be used;

The device shown in Fig. 8 is employed for holding the reamer in the center Awhen reaming a long hole or two short'holes in line with each other. It is inserted over the stem and usually lies between the screw 16 and the slots 17, ythe small end ofthe cone facing toward the slotsf17. It is a very'useyful and necessary part in performing certain classes of mobiles. y Y.

What is claimed is Y j Y Y l. In a reamer, a slotted stem, bladeshaving tapered ends and fitting in the slots of the stem, and adjustingV means within the` stem for the blades, said adjusting means including blocks movable-longitudinally vof and within the stem and having wings eX` Instead of .i

work, particularly on autoz tending into saidslots for supporting the blades in adjusted position and Vfor preventing rotation of saidrblocks within. the Astem.' I i 2'. In a reamer, a slottedstem, blades 'hav ing tapered ends and fitting in the slots ofV the stem, 'and adjusting means within the' stem for the blades, said adjusting means including blocks movable longitudinally of and within the stem yand having wingsextending into said slots, said blocks and saidV wings being uniformly tapered, thereby pro-v viding supporting surfaces forpthe tapered ends of the blades; y

8. In a reamer, a hollow stem having lon` gitudinal slots, blades positioned inthe slots, n

said blades having central recessesat the inl i ner edges thereof, means for adjusting the positions of the blades, and meansVV for' clamping the bladeasaidfclamping means including a collar within thefstem, and Y screws passed through the stem and engagingwith the collar, the recesses of theblades fr fitting above the collar. Y 4. In a reamer, a hollow stem, an'radjust'- ing bolt within the stem, a centering collar..

at the outer end of the stem,a second collar within the Ystem surrounding the'inner vof the bolt, anda locking VscrewY operable'V Y from without the stem and engagingthe second collar to hold itinplace and when tightened locking the adjusting bolt. i

Y 5. YIn a reamer, blade adjusting meansin-Y portions-on the bolt'near the ends rthereof and separated b a lain section of the bolt, blade engagi blocs mounted on said bolt and engageab e with the threaded sections thereof either separatel or simultaneously, the plain section of the bolt having a length greater than the combined length of the two blocks, said blocks when disengaged from the threaded sections being slidable along said lain section.

6. a reamer, a slotted hollow stem, blades fitting in the slots of said stem and having tapered ends, a bolt having right and left hand threads near the ends, and an un-` threaded portion between said threads, collars fixed within the stem forming su ports and bearings for the ends of the bolt, locks mounted within the stem to move on the threaded portions of the bolt, and wings on the blocks fitting in the slots of the stem and enga the ends of the blades.

n a reamer, a slotted hollow stem, blades fitting in the slots of said stem and having tapered ends, a bolt having right and left hand threads near its ends, and an nnthreaded portion between said threads, collars fixed within the stem forming supports and bearings for the ends of the bolts, one of the collars being located at the outer end of the stem, said bolt projecting beyond said collar so that it may be turned, the other collar bein provided with means for locking the bolt m rotation, blocks mounted within the stem to move on the threaded portions of the bolts, and wings on the blocks fitting in the slots of the stem and engaging the ends of the blades.

8. In a reamer, a hollow stem having longitudinal slots extending to one end thereof,

lades receivable in said slots, means for adjusting the positions of the blades within the slots, and means for clampin the blades whatever their positions, said clamping means comprising a collar housed within the stem, a screw passed through each section of the stem defined by two of the slots and engaging with the collar, whereby the stem sections may be drawn inwardly toward the collar to clamp the blades between them, a second collar mounted within the stem at the slotted end thereof, a bolt rotatable in both collars and coaxial with the stem, a pair of blocks mounted on the bolt near the ends thereof and movable longitudinally of the stem by rotation of the bolt, said blocks supporting the ends of the blades when recelved within the slots, the second named collar acting as a stop for the adjacent block, and screws passed through each slotted stem section and engaging with the second collar t0 hold the same 1n place.

In testimony, that I claim the foregoing as my own, I have hereto aiiixed my slgnature 1n the presence of two witnesses.

GEORGE LENHART.

Witnesses CHARLES WHITAKEB, BERTHA BLAINE. 

